He did not start to read until he was
ten.It was not until he was ten that he
started to read.not本不在until的从句里，为什么变成强调句时，强调部分是it
was not until...,而不是it was until he was
ten that he did not start to read.?
No matter how the math works out, you persistently view restaurants with voluntary tipping systems as being a better value, which makes it extremely difficult for restaurants and bars to do away with the tipping system.此处的as翻译成什么合适？
... time since they get used to checking different social media platforms,and it's hard to refocus their focus.划线部分是什么结构，be able to是动词短语，cause也是动词 同一句中不能出现两个原型啊？这句话对吗？
The regrowth in plants also brought back many animals to the land. This return of life to Glacier Bay is why it is sometimes called "a land reborn."请问老师，句中的介词 in 和 of 可以互换吗？
...e ( ) abused by the power of the social rule, we must take steps to defuse its energy.A. were not to beB. are not to beC. should not beD. would not be这个题老师说是虚拟语气，对将来的否定，选A；但是网上说是普通的主将从现选B.可是我认为这个题不符合这两个...
As it happens , we had been having a great number of cases of
diphtheria in the school to which this child went during that month.
请问在这里使用完成体和完成进行体的区别是什么？
完成进行体更强调事件在那个月里不断发生吗？还是本质区别并不在此？
...